Ok, I'm getting closer to the problem (maybe).The problem seems to be that DVDs are automatically mounted, whereas CD's are not.

In dconf Editor, I set the desktop to show mounted volumes, andin the auto start menu, I unchecked to auto play audio and video filesand unchecked browse inserted media, so that the only thing left checked was auto mount inserted media.

I just wanted to see what would be auto mounted and what would not.Well, I tried several DVDs and they all auto mounted.

Then I tried several CDs and none auto mounted.

But when I have a CD inserted and click on it in Nemoit mounts and then I start VLC and it plays.

(However, when I try to open an audio CD with the Media Player that comes with Peppermint, (XPlayer) it won't play)

So, just to eliminate this particular DVD player,I setup another desktop identically and I get the same results.

That leaves 2 questions:1) Why do the DVDs auto mount and not the CDs ?2) Why will VLC play the audio CDs but XPlayer won't ?

Update: When I insert any audio CD that has .wav files on it,it will not automount.

When I click on it in Nemo, it mounts andall the tracks are displayed. (Track 1.wav, Track 2.wav, etc.)

If I right click on a track and open with vlc, it plays ok.If I right click and open with Media Player (Xplayer),I get the error, 'The specified movie could not be found'.

Also, on each track icon there is a lock symbol in the lower right corner.If I copy a track to the hard drive, the icon on the copied track no longerhas the lock symbol, and the copied track then plays ok with media player.

Evidently, that lock symbol is what is stopping the CD from automountingand stopping Xplayer from playing it.

Why vlc will play it from the CD but not Xplayer, I don't know,but even though vlc will play it from the CD after clicking on a track,vlc won't automount or autoplay it like it does with a DVD.

Do the tracks on some audio CDs have a lock symbol and some don't ?

As I said, I've tried this on anothe desktop with identical setup with same results.I also tried it using the MX Linux OS and it also gave the same results.

(Just for the heck of it, I also tried all these audio CDs I've been using on a computerwith Windows 7 and there was no problem)